30509381 has 8 divisors (see below), whose sum is σ = 34993344. Its totient is φ = 26056800.

The previous prime is 30509377. The next prime is 30509387. The reversal of 30509381 is 18390503.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 30509381 - 2² = 30509377 is a prime.

It is a super-2 number, since 2×30509381² = 1861644658006322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30509387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5720 + ... + 9681.

It is an arithmetic number, because the mean of its divisors is an integer number (4374168).

Almost surely, 2^30509381 is an apocalyptic number.

It is an amenable number.

30509381 is a deficient number, since it is larger than the sum of its proper divisors (4483963).

30509381 is a wasteful number, since it uses less digits than its factorization.

30509381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15691.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 30509381 is about 5523.5297591305. The cubic root of 30509381 is about 312.4720179745.

Adding to 30509381 its reverse (18390503), we get a palindrome (48899884).

The spelling of 30509381 in words is "thirty million, five hundred nine thousand, three hundred eighty-one".